Plait-folder for sewing-machines.



A. H. DE VOE.

PLAIT FOLDER FOR SEWING MACHINES.

APPLICATION FILED JAN. ll, I909.

June 8, 1915.

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UNITED STATES PATENT OFFICE.

ALBERT H. DE VOE, OF ELIZABETH, NEW JERSEY. ASSIGNOR TO THE SINGER MANUFACTURING COMPANY, A CORPORATION OF NEW JERSEY.

' PLAIT-FOLDER FOR SEWING-MACHINES.

Specification of Letters Patent.

Patented June 8, 1915.

Application filed January 11, 1909. Serial No. 471,590.

To all whom it may concern:

Be it known that I, ALBERT H. DE Von, a citizen of the United States, residing at Elizabeth, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Plait-Folders for'SewingMachines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to improvements in plai-t folders for sewing machines, and has for its object to provide a device which may be readily adjusted to form box plaits of various widths and conveniently manipulated to present the material to the action of the stitch-forming mechanism.

Referring to the accompanying drawings, in the several figurcs of which like parts are similarly designated, Figure l is a view in perspective of the improved folding attachment, together with so much of the bedplate and the stitch-forming and cloth-feeding mechanism of the sewing machine as is deemed essential for a proper understanding of the invention. Fig. 2 is a plan View of the folding mechanism detached from the sewing machine with the attachment baseplate omitted. Fig. 3 is a view in front side elevation of the mechanism shown in Fig. 2, together with the attachment base-plate. Fig. 4 is a view in section on the line XX, Fig. 2, including the base-plate shown in Figs. 1 and 3 and a portion of the head of the over-hanging arm of the sewing machine. Fig. 5 is a detail perspective view of one of the several sliding connections for effecting the adjustment of the guiding and folding fingers.

1 represents the bed-plate of the sewing machine, 2 thefront slide-plate, 3 the back slide-plate, 4 the throat plate, 5 the clothpresser, 6 the cloth-presser bar, 7 the needlebar, 8 the needles, 9 the feed-dog and 10 a portion of the head of the overhanging arm of the sewing machine.

11 represents a bracket secured to the head 10 by screws 12 (one only of which is shown) which pass through elongated openings 13, 13 and are threaded into said head,

the lower arm 14 of said bracket being pro vided with oppositely arranged complemental folding blades 15 and 16 which are adjustably secured by screws 17 and 18, pass ing through the respective slots 17 and 18 to said arm.

19 represents the attachment base-plate provided with hollow standards 20 and 22, the latter of which forms a bearing for the rock-stud 23 carrying the adjusting plate 24, said rock-stud having secured to it, by screw 25, an arm 26 connected by a link 27 to an arm 28. The arm 28 is secured by a suitable set-screw (not shown) to a rock-stud 29 (shown in dotted lines only, Fig. 2) mounted in the standard 20, said rock-stud 29 being provided with an adjustable plate 30 similar to the plate 24 but of less length. The outer end of the arm 26 is provided with an opening 26 to accommodate the adjustment of the link 27 when it is desired to form the folds parallel with the seam formation. By connecting link 27 with opening 26 the plate 24 will be adjusted to such an angle to plate 30 that the fingers 42 and 43 will lie parallel to each other.

31 is an adjusting lever formed integral with the arm 28 and provided with a clamping member 32 which is secured against accidental adjustment by a pinch screw 33.

34 and 35 are complemental swinging arms, each of which is pivoted at one end upon the stud 36 secured by screw 37 to the base 19, the opposite ends 38 and 39 of said arms being pivotally attached by pins 40 and 41 to the respective guiding and folding fingers 42 and 43, whereby said fingers are held against movement in the direction of their length.

Secured in the opposite ends of each of the adjusting plates 24 and 30 are pins 44 which extend in opposite directions from said plates through vertically arranged complemental slots 45 formed in the guiding and folding fingers 42 and 43, said pins acting, through the oscillating movements of said plates, to adjust said fingers according to the width of the box plait desired. As the pins carried by the plate 30 describe an are of less radius than the pins carried by the plate 24, the fingers 42 and 43 when adjusted in directions away from each other are caused to occupy positions at an angle to the line of the seam formation, thus causing the material to be gradually stretched as it is advanced to the action of the needles, and rendering less liable any deviation of the material from a straight line of feed.

The plate 19 is indexed to facilitate the adjustment of the member 32 for forming box plaits of 1%; and 1% inches width, Fig. 2 representing the adjustment of said member for producing a plait substantially 1% inches wide.

In the operation of the device, the fingers 42 and 43 are first moved to their narrowest adjustment when the material is passed over the fingers and around and underneath the folding blades 15 and 16, the body portion of the material extending in opposite directions from underneath said folding blades, after which the operator adjusts the member 32 which, through its connection with the plates 24 and 30, effects the desired width of plait.

What I claim herein is:

1. In a box plait folder for sewing machines, a baseplate, folding and guiding fingers mounted thereon, swinging connections for holding said fingers against movement in the direction of their length, adjusting plates mounted upon said base-plate and operatively connected with said fingers for determining the extent of adjustment of said fingers in directions toward and from one another, and a bracket provided with oppositely arranged folding blades suspended above the bed-plate of the sewing machine.

2. In a box plait folder for sewing machines, a base-plate, complemental folding and guiding fingers mounted thereon and operatively connected with each other through swinging connections and oscillating adjusting plates, said connections acting to secure said guiding fingers against movement in the direction of their length, and said oscillating plates acting to effect the adjustment of said fingers at an angle to the line of seam formation, and a bracket provided with adjustably secured folding blades suspended above the bed-plate of the sewing machine, in combination with means, including an adjusting lever for simultaneously oscillating said adjusting plates.

3. In a box plait folder for sewing machines, a base-plate provided with an index, complemental folding and guiding fingers mounted thereon, a pivoted lever codperating with said index and suitable connections between said lever and folding and guiding fingers for gaging the width of the plait, and a bracket provided with oppositely arranged folding blades suspended above the bed-plate of the sewing machine, in combination with means for adjusting said folding and guiding fingers toward and from one another, and means acting to hold said fingers against accidental movement when positioned to effect the desired width of plait.

4. In a box-plait folder for sewing machines, a base-plate, complemental guiding and folding fingers mounted thereon, a bracket provided with oppositely arranged folding blades suspended above said base plate, in combination with adjusting means including oscillating adjusting plates for simultaneously adjusting said guiding and folding fingers with respect to said folding blades.

5. In a box plait folder for sewing machines, a base-plate provided with an index, complemental folding and guiding fingers mounted thereon, a pivoted lever codperating with said index and suitable connections between said lever and folding and guiding fingers for gaging the width of the plait, and a bracket provided with oppositely arranged folding blades suspended above the bed-plate of the sewing machine, in combination with means for simultaneously adjusting said folding and guiding fingers toward and from one another, and means acting to hold said fingers against accidental movement when positioned to efiect the desired width of plait.

6. In a box plait folder for sewing machines provided with a bed-plate, the combination with a base-plate, complemental folding and guiding fingers mounted thereon, a bracket provided with oppositely arranged folding blades suspended above said bedplate, of means including adjusting plates operatively connected with said fingers, one of said plates being adjustable with respect to said fingers for moving the latter into parallel relationship with and at a slight angle to each other.

7. In a box plait folder for sewing machines, the combination with a base-plate, complemental folding and guiding fingers mounted thereon, a bracket provided with oppositely arranged folding blades suspended above the bed-plate of the sewing machine, of means including adjusting plates operatively connected through sliding elements with said fingers, one of said plates being adjustable with respect to said fingers for moving the latter into parallel relationship with and at a slight angle to each other.

8. In a box plait folder for sewing machines, the combination with a base-plate, complemental folding and guiding fingers mounted thereon, a bracket provided with oppositely arranged folding blades suspended above thebed-plate of the sewing ma- In testimony whereof, I have signed my chine, of rneans including manually conname to this specification, in the presence of trolled adjusting plates operatively contwo subscribing Witnesses.

nected With said fingers, one of said plates ALBERT H. DE VOE. being adjustable with respect to said fingers WVitnesses:

for moving the latter into parallel relation- VICTOR E. SMITH,

ship With and at a slight angle to each other. LILLIAN M. MILLER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

